brickell



(No Model.) 2 Sheets-Sheet 1.

N. BRIOKELL.

MACHINE FOR GRINDING TOOLS. No. 320,755. Patented June 23', 1885,

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(No Model.) 2 Sheets-Sheet 2. N. BRIOKELL.

MACHINE FOR GRINDING TOOLS.

N0. 320,755. Patented June 23, 1885.

LHJIFIEEEEE humfiq. awwmwk /WM UNITED STATES PATENT OFFICE.

NICHOLAS BRIOKELL, OF BRINKLEY, ARKANSAS, ASSIGNOR OF ONE-HALF TO THOMAS J. BRIOKELL, OF SAME PLACE.

MACHINE FOR GRINDING TOOLS.

SPECIFICATION forming part. of Letters Patent No.320,755, dated June 23, 1885.

Application filed October .10, 1884. (No model.)

To all whom it may concern..-

. Be it known that I, NICHOLAS BRIoKELL, a citizen of the United States,residing at Brinkley, in the county of Monroe and State of Arkansas, have invented certain new and useful Improvements in Machines for Grinding Tools, of which the following is a specification, reference being had therein to the accompanying drawings. My invention relates to improvements in machines for grinding tools, the object of Which is to provide a simple, cheap, strong, and durable device for holding tools on a grindstone, so that one man can grind them I 5 and do the work quicker and better than two men in the usual way of holding by hand. These objects I attain by means of the device illustrated in the accompanying drawings, forming a part of this specification, in which Figure 1 is a view in elevation of the entire device from the side and back end. Fig. 2 is a top or plan view of the same. Fig. 3 is a side and end elevation of a modification of the clamp for rounded tools. Fig. at is a front view 2 5 of the cross-piece and clamp. Fig. 5 is a view of a tool ground in this device, and Fig. 6 a view of a similar tool which has been ground by or upon a plane surface or without being held in one position on a circular stone.

Similar letters indicate corresponding parts in all the figures.

A is an ordinary bench, of any desired size and shape, for supporting an ordinary grindstone, B. Said bench has the usual legs, a, and supports 1), on which are the ordinary bearings, and it has a crank, 12, for turning the stone, but in its place may be used a belt- Wheel.

0 C are uprights attached to the sides of the bench by any suitable means so as to swing back and forth, preferably by pins or a bolt, 0, extending through the bench.

L L are supports attached to the uprights, and having holes 1 Z, which receive the pins Z 5 of the bench.

E is a cross-piece hung between and having bearings in the uprights, so as to rock back and forth. To this cross-piece is detachably secured a clamp, G, preferablyattached by means of pivot-bolt having a thumb-screw, g,

so as to permit the clamp to swing or turn from side to side.

g are pieces placed crosswise of the piece E, to facilitate the motion of the clamp and to prevent wear.

G is a clamp, formed in any desired shape and of any desired size, to hold the tools firmly. It is composed of plates secured to each other by means of thumb-screws g 9. For fiat tools two plates, g are preferable, the upper one having ahandle, g. Thelower one is secured by the pivot-boltgt For curved or rounded tools-as gouges, turners tools, &c. -the lower plate, 9", is provided with a rod, 9 to which the curved plateg is secured -by means of ears g g", or otherwise, so as to roll from one side to the other to admit all parts of the edge of the tool to the stone,whi1e by the pivot-bolt securing the clamp to the cross-piece it may be turned as desired. The upper plate, 9, is secured by the thumbscrews 9 g, and, if desirable, a thumb-screw, 0, may be used to assist in holding the tool, and is best for holding small tools.

K is an arm attached to the crosspiece E at one end and to a lever, F, by means of a connecting-link, H, at the other, so as to tip the block or crosspiece E by means of the lever. One of the uprights,0,is made long to serve as a fulcrum, f, for the said lever.

On the long end, f", of the lever is attached a plate, f, having notches f. Said plate is made to project beyond the edge of the lever.

J is a post attached to the bench so as to swing back and forth. It is provided with notches or catches j made on the post or, preferably, 011 a plate, j attached to the side of the same, so as to project to enter and engage the notches of the plate f.

The device is operated thus: A tool to be 0 ground is placed in the clamp. If flat, in the straight one, if rounded, in the curved one. The clamp is tightened by the thumb-screws and secured by the pivot-pin to the crosspiece. The uprights are raised until the tool is brought overthe center of the stone and then secured by the supportsL L. The position. of the cross-piece is regulated by the length of the supports and its height in the uprights, which may be accomplished by the 100 holes 0 and Z. The tool is broughtdown upon the stone by the lever F, as stated, by pressing the long end, f", which raises the arm K and turns the cross-piece. WVhen the pressure on the stone is suflicient, the lever is caught in a notch, j, of the post. This may be increased, when desired, by drawing the lever down to a lowernotch; but if that should make it too strong the post may be pushed to one side to engage a notch, f, until the desired pressure is reached. The handle g is used by the left hand to move the tool, when desired, from one side to the other of the stone, and to roll it, if rounding. Thus I have a tension formed by the notches in the post and lever which will nicely adjust the pressure and keep it uniform, and by means of the handle 9 and the pivot-pin it may be placed on different parts of the stone to cause it to wear evenly. By this device the tool is given a concave bevel, 00 Fig. 5,whieh will stay sharp longer and is more easily kept sharp by whetting than the straight bevel 00, Fig. 6,ordinarily given in grinding. Thus my device saves the grindstone and the tools as well as the labor of one man.

Having thus described the construction, use, and operation of my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A device for grinding tools, composed of a bench, A, grindstone B, uprights attached to the said bench, and adjusted in position by braces L L, having holes Z, to engage pins Z, clamp G, having setscrews g, and a handle, 9, rocking cross-piece E, arm K, connectinglink H, lever F, having a plate, f, and a post, J, having a plate, j, in which are notches j, substantially as shown and described.

2. A device for holding tools to be ground, comprising uprights O O, rocking cross-piece E, clamp G, arm K, connecting-link H, lever F, and notched post J, all substantially as and for the purpose set forth.

3. In combination with a grindstone and bench,uprights G 0, having adjustable braces L L, a rocking cross-piece, E, clamp G, and handle 9, substantially as set forth, for the purpose specified.

4. A rocking-piece, E, having pieces g and a thumb-screw, g, and upright bearings O 0, combined with a el amp, G, having set-screws for holding and a handle for turning the tool to be ground, substantially as shown and described, for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

NICHOLAS BRIOKELL.

W'itnesses:

M. H. VAUGHAN, JNo. T. Box. 

